Swift_TransportException | Connection could not be established with host smtp.gmail.com [Network is unreachable #101] laravel 5.7 - swiftmailer

Question

i want to send email using Laravel 5.7, and that error shown to me !!
someone help me please.
My .env file :
MAIL_DRIVER=sendmail
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=xxx#gmail.com
MAIL_PASSWORD=xxxpass
MAIL_ENCRYPTION=tls
My mail config file :
<?php
return [
/*
|--------------------------------------------------------------------------
| Mail Driver
|--------------------------------------------------------------------------
|
| Laravel supports both SMTP and PHP's "mail" function as drivers for the
| sending of e-mail. You may specify which one you're using throughout
| your application here. By default, Laravel is setup for SMTP mail.
|
| Supported: "smtp", "sendmail", "mailgun", "mandrill", "ses",
| "sparkpost", "log", "array"
|
*/
'driver' => env('MAIL_DRIVER', 'smtp'),
/*
|--------------------------------------------------------------------------
| SMTP Host Address
|--------------------------------------------------------------------------
|
| Here you may provide the host address of the SMTP server used by your
| applications. A default option is provided that is compatible with
| the Mailgun mail service which will provide reliable deliveries.
|
*/
'host' => env('MAIL_HOST', 'smtp.gmail.com'),
/*
|--------------------------------------------------------------------------
| SMTP Host Port
|--------------------------------------------------------------------------
|
| This is the SMTP port used by your application to deliver e-mails to
| users of the application. Like the host we have set this value to
| stay compatible with the Mailgun e-mail application by default.
|
*/
'port' => env('MAIL_PORT', 587),
/*
|--------------------------------------------------------------------------
| Global "From" Address
|--------------------------------------------------------------------------
|
| You may wish for all e-mails sent by your application to be sent from
| the same address. Here, you may specify a name and address that is
| used globally for all e-mails that are sent by your application.
|
*/
'from' => [
'address' => env('MAIL_FROM_ADDRESS', 'hicham.braima#gmail.com'),
'name' => env('MAIL_FROM_NAME', 'PMT Admin'),
],
/*
|--------------------------------------------------------------------------
| E-Mail Encryption Protocol
|--------------------------------------------------------------------------
|
| Here you may specify the encryption protocol that should be used when
| the application send e-mail messages. A sensible default using the
| transport layer security protocol should provide great security.
|
*/
'encryption' => env('MAIL_ENCRYPTION', 'tls'),
/*
|--------------------------------------------------------------------------
| SMTP Server Username
|--------------------------------------------------------------------------
|
| If your SMTP server requires a username for authentication, you should
| set it here. This will get used to authenticate with your server on
| connection. You may also set the "password" value below this one.
|
*/
'username' => env('MAIL_USERNAME'),
'password' => env('MAIL_PASSWORD'),
/*
|--------------------------------------------------------------------------
| Sendmail System Path
|--------------------------------------------------------------------------
|
| When using the "sendmail" driver to send e-mails, we will need to know
| the path to where Sendmail lives on this server. A default path has
| been provided here, which will work well on most of your systems.
|
*/
'sendmail' => '/usr/sbin/sendmail -bs',
/*
|--------------------------------------------------------------------------
| Markdown Mail Settings
|--------------------------------------------------------------------------
|
| If you are using Markdown based email rendering, you may configure your
| theme and component paths here, allowing you to customize the design
| of the emails. Or, you may simply stick with the Laravel defaults!
|
*/
'markdown' => [
'theme' => 'default',
'paths' => [
resource_path('views/vendor/mail'),
],
],
/*
|--------------------------------------------------------------------------
| Log Channel
|--------------------------------------------------------------------------
|
| If you are using the "log" driver, you may specify the logging channel
| if you prefer to keep mail messages separate from other log entries
| for simpler reading. Otherwise, the default channel will be used.
|
*/
'log_channel' => env('MAIL_LOG_CHANNEL'),
];
i already had Activate 'Less secure' in my gmail.
ERROR : Swift_TransportException | Connection could not be established with host smtp.gmail.com [Network is unreachable #101] laravel 5.7
Please help me.